Oil pump



A. W. F. MANzEL OIL PUMP l Filed Jan. 15I 1925 s sheets-sheet 1 mog/20 y/fnlagzzggmnfor Aug. 5, 193D.

Aug. J, 1930. A. w. F. MANzEL OIL PUIP Filed Jan. 15, 1925 3 Sheets-Sheet 2 waz/JL Q7@ Aug. 5, 1930. l A. w. F. MANZEL OIL PUIP Filed Jan. 415, '1925 s sheets-sheet s INMI Patented Aug. 5, 1930 aia ina-.aia

orriics i ADOLPH W. F. MANZELOF BUFFALO, NEW YORK, ASSIGNOR TO IVIAN'ZEL BROS. CIO., OF BUFFALO, NEVI YORK, A. CORPORATION' OF NEVI YORK OIL PUMP Application filed January 15, 1925. Serial No. 2,710.

One of the objects of my invention is the` production of an improved oil pump Whereby the exact quantity of oil ied to a part or parts to be lubricated can be readily seen through a sight-tube.

Another object of my invention ils to provide a multiple oil pump embodying a plurality of pump'elements actuated by a mechanical element common to all, and Wherein provision is made for actuating said pump elements, either mechanically or manually.

Another object of my invention is to provide an oil pump having a plurality of pump elements adapted to feed oil in predetermined quantities to diiierent part-s to be lubricated,

said pump elements being actuated by a me-,gA chanical element common to all; and Wherein provision is made for manually actuatingany pumpv elementindividually to increase the quantity of oil fed to any individual part being lubricated. A further object of my invention is to provide an oil pump of the type mentioned andV in which a plurality of pump elements are included, and to provide novel means for regulating the quantity ot oil fed by each pump element. l

A further object of my invention ils to provide an oil pump having a plurality of pump elements, a sight-tube connected With veach pump element and through which the oil fed by said pump elements rises in predetermined quantities; and to equip said pumpy with means to accurately determine the quantity of oil fed by each pumpelement, if for anyl reason the quantity fed through the sight-tube cannot be determined With certainty, this being particularly desirable due to the tact that oil passing through a sight-l tube, particularly in globular form, becomes magnified and malresit diliicult to determine the exact quantity passing therethrough.

A 'further object ot my invention 1s to provide an oil pump with a sight-'tubeand to so fasten the tube in place that leakage of oil is absolutely prevented, and so that the tube can be readily removed from'its place` for cleaning the same.

A further object of my invention is to provide means for draining the sight-tube sok that said tube canV be removed Without any possibility of the liquid matter contained therein being Wasted, and at the same time guard against the liquid matter splashing over parts of the pump and necessitating" cleansing of the same.

A still further object of my invention is to provide the sight device through which the lubricant fed by the pump is adapted to pass With means for maintaining a clear vision through the'sight-tube of the device so that the oil passing through said sighttube can be readily seen.

A still further object is, to provide an oil pump having an oil casing and a pump element enclosed by said casing, and to equip the pump with exteriorly accessible means for regulating the quantityy of oil fed by said pump element.

Vith the above and other objects in View, the invention consists in the novel featuresV of construction. and Vin the arrangement and combination of parts to be hereinafter described and more particulm pointed out in the subjoined claims.

In the drawings-z* F ig. l is a front alex/anon of a multiple feed oil pump constructed in accordance WithA my invention.

Fig. 2 is an end view of the same showing the actuating pitman removed therefroml Fig. 3 is an enlarged transverse section, taken on line 3-3, Fig. l, looking in the di'-` rection of the arrow crossing said line.

Fig. 4 is an enlarged horizontal section, taken on line 4 4, Fig. l.

' Fig. 5 is an enlarged vertical section taken on line 5 5, Fig. '2.

Fig. 6 is a detached perspective View of one of the removable linings or segments situated behind each oil sight-tube.

Figi? is a horizontal section on an enlargedI scale taken through a portion of one of the linings or segments, as indicated by the line 7-7, Fig. 6. v

Fig. 8 is a vertical longitudinal section through a portion of the cam shaft and one of the actuating levers of one of the oil feeding units, the same being taken on line 8 8, Fig. 3.

Fig. 9 ils a perspective view of one of the oil guiding wires along which the oil delivered through the oil sight-tubes is guided.

Fig. 10 is a detached perspective view of one of the piston plunger stops.

Fig. 11 is a detached perspective view of one of the actuating levers.

Fig. 12 is a horizontal section taken on line 12-12, Fig. 3. V

Referring to the drawings in detail, 13 designates the casing which serves as an oil chamber, and in preferred form is constructed of sheet material and given a substantially rectangular form. lVhile this casing or chamber may be variously constructed, in the drawings it is shown as having a bottom 14: provided with upstanding marginal flanges 15, front and rear walls 16, 17, respectively, and end walls 18, 19, respectively. The front, rear and end walls surround the upstanding marginal flanges of the bottom 1f-l, and by any suitable means are secured thereto in a liquid-tight manner. The front, rear, and end walls have inturned flanges at their upper ends which are comparatively narrow so that a comparatively large opening is provided at the top of the casing. Said opening is closed with a removable cover 21, a gasket 22 being placed between the inturned flanges 20 and said cover, and screws 23 being passed through said cover Vand gasket and having threaded engagement with said inturned iianges to securely fasten the cover to said casing.

The cover 21, or top of the casing, as it may be termed, is provide-d with a filler tube 211 through which oil is to be delivered into the casing to be fed therefrom by a plurality of oil-feeding units to be hereinafter described. The oil may, however, be delivered into the casing in any other suitable manner. For convenience in determining the level of the oil within the casing or chamber 13, an oil gage 25 is suitably fitted within a depressed portion 26 arranged at one corner of the casing, and for the purpose of fastening the oil pump to a. machine or other suitable support, brackets 2'? are fastened to the exterior of the casing at the lower end thereof.

Extending longitudinally through the casing or oil chamber is an operating shaft 28 formed preferably of hexagonal material along a length extending from one end wall to the other of the casing and having at opposite ends cylindrical portions 29 which are journaled in bearings 30 secured to opposite end walls. The bearings 30 are preferably in the form of stuffing boxes, as clearly shown in Fig. 4;, so that leakage of oil along thev operating shaft cannot take place. By constructing the operating shaft of hexagonal material, and turning down the ends thereof to form cylindrical journals, shoulders y31 are provided which bear against the inner ends of the bearings 30 so that lengthwise movement of the shaft is prevented.

Mounted on the hexagonal portion of the operating shaft are a number of cams 32 which are spaced at regular intervals along the shaft, and each cam comprises two spaced disk-like members 33, each extended outwardly at corresponding points, and between the extended portions of each pair of disklike members a roller 34; is rotatably mounted on a pin 35 straddling the space between said disk-like members and fastened at opposite ends into said members.

In the drawings I have shown five oilfeeding units and each includes a cam 32. The series of cams are arranged along the hexagonal portion of the operating shaft and are spaced apart by sleeves 36, and between the outermost cams of the series and the adjacent end walls, spacing `sleeves 37 are arranged. In this manner the cams are held against movement lengthwise along the shaft, and by reason of said shaft being of hexa gonal formation, the disk-like members of the cams are provided with hexagonal openings into which the hexagonal portion of said operating shaft is fitted.

Although I have shown and described the operating shaft as of hexagonal formation in cross section, it will be apparent that this shaft may be given any other non-cylindrical formation and the disk-like members of each cam provided with openings to conform to the cross sectional formation of the shaft to permit of their being slipped onto the shaft. If the advantages derived from such assemblage are not desired, the cams may be fastened to the operating shaft in any well known manner, but I consider the special arrangement and assemblage set forth to be essential from the view point of durability and simplicity, and especially for the reason that slippage or displacement of parts cannot take place.

Arranged parallel with the operating shaft and extending through the casing or 'oil chamber, is a fulcrum bar or spindle 38, the ends of which are stepped in bearings 39 secured in the end walls of the casing 13. Each bearing 39 comprises an externally-threaded socket thrust through an opening in one of said end walls and provided with a head r-lO which bears against the outer surface of said wall, said socket having a nut 41 threaded there-on which bears against the inner surface of the wall and thus holds the socket in place.

Spaced on said fulcrum bar or spindle 38 is a series of actuating levers 42, one being provided for each cam 32 and co-operating loo IUS

lil)

therewith. Each lever is stamped of a piece of sheet material Vand has two parallel side members 43 connected at their upper edges by a cross or Contact member 44. Said side' members 43 have alined openings 45 at corre-V sponding ends through which the fulerum bar or spindle 38 is passed, and similar openings 46 are provided at the opposite ends lof sait side members, for a purpose to appearV hereinafter.

Arrangement between the actuating levers and surrounding the fulcrum bar or spindle 38 are spacing sleeves 47 and similar sleeves 48 are provided between the end actuating levers of the series and the bearings 39. Tn this manner the actuating levers are maintained in alinement with the cams 32 secured to the non-cylindrical operating shaft 28.

Fastened to thewalls of the casing is a series of pump elements 49, one pump element being provided for co-operation with each actuating lever. Each pump element has a body or casting provided with a main vertical. portion 50, in the main or cylindrical cross sectional formation, and provided with an axial bore 5l serving as a cylinder. Said main vertical portion is enlarged at its lower end and counterbored so as to form a downwardly facing shoulder 52. The counterbored part of said main vertical portion is internally threaded and receives a cap sleeve 53 which closes the lower end of said counterbored part and said cap sleeve has an externally threaded axial boss 54 at its outer end which is passed thr-ough an opening in the bottom 14 of the casing, a. nut 55 being threaded onto said boss and bearing against the under side of said bottom to securely fasten the cap and consequently the pump element in position within the casing.

Slidably lit-ted in said plunger cylinder 51 and inserted therein from the upper end thereof is a piston plunger 56, which has an externally threaded reduced upper end 57 onto which a collar 58 is threaded, said collar bearing against the shoulder formed by reducing the upper end of Said plunger. The plunger cylinder has a nipple 59 extending laterally therefrom, which is internally threaded and the interiorof which is in communication with the interior of the plunger cylinder through the medium of a port 60 serving as the oil inlet for said plunger cylinder. Threaded into said nipple is a headed sleeve nut 6l and between the outer end of said nipple and the head of said sleeve nut, a stop element 62 is clamped, said stop element being shown in detail in Fig; 10 and being preferably constructed of sheet material fashioned t0 provide two side members 63 and a connecting cross member 64, said cross member having an opening 65 at its lower end through which the threaded portion of the sleevenut 6l is passed. The head of said sleeve nut bears against the outer side of the connecting cross member 64 and forces the inner side of said cross member again-st the end of the nipple 59 so as to securely fasten the stop element in place. The stop element extends upwardly from its point of fastening and the side members 63 have forwardly extending stop ears 66 at their inner edges, which are adapted to be engaged by the" collar 58 threaded onto the upper end of the piston plunger 56. Y The plunger cylinder has a flange 67 formed to extend aroundV the same and the upper face of this flange is preferably in line with the highest point of the nipple 59; Surrounding the upper endof the plunger cylinder is a spiral spring 68, the lower end of which bears against said flange and nipple and the upper end against the collar 58, whichv for convenience may be termed the pistonplunger collar, the purpose of said spring; being to elevate the pistonr plunger under' conditions to appear hereinafter.

Threaded into the outer end of the sleevev nut 6l attached to each pump element is an oil inlet pipe 69, which is preferably curve'din the form of an elbow and its depending portion is inserted into a screen or filter 70.v Said screen is preferably of cylindrical formation and comprises a top 7l, al bottom 72',A and a cylindrical wall 73 holding said top and bottom spaced apart and being prefer.- ably formed of wire mesh material; but if de-l sired, any other suitable materialmaybe used` for filtering the oil drawn into the pump element. The depending portion of the cilinlet pipe extends through an axial opening in the top of said screen or filter, andv its lower end bears againstt-he up-per surface of the;

bottom thereof. Said bottom has an axialopening therein through which a screw 7 4 is passed, which is threaded into the lowerextremity of said pipe, said-pipe being' internally threaded to receive said screw.. Thehead of the screw bears against the under side of said bottom, andin this manner thes'creenor filter is properly maintained' on the oilinlet pipe, which is provided with one or more oil inlets 75 within said screen oriilter.

Thrust through the alined openings 46 at` the outerk end of each actuating lever is ai cylindrical bar or block 76. Saidvbar or block extends from opposite sides of the lever, and near each end is provided with an ane nular external groove 77. Snapped into each of said grooves is a spring ring 78, one' ring bearing against one side of-the lever andV the other against the other side thereof toprevent lengthwise movement ofsaidv cylin drical bar or block in said lever, vyetpermit.- said bar or block to be givenl slight rotary movement within t-he openings-of said lever.;

Threaded adjustablythrough each ofv said cylindrical bars-or blocks is ai push-rod 7 9, the lower end Vof which bears against thel plunger collar 58 while the upper endftheeof? extends upwardly a distance above the cylindrical bar or block. By reason ot said bar or block supporting the push rod, it may, in a broader sense be termed a push-rod support. T o limit the adjustment of' said push rod within said cylindrical bar or block, a stop pin is passed therethrough above said bar or block, and a similar stop pin 81 is passed therethrough beneath said bar or block, the distance between said stop pins determining the range ot adjustment ot the push rod through said bar or bloclr.

It is to be noted that the spiral spring.; 68 tend, at all times, to torce the piston plungers 5.6 ot' the several pump elements upwardly, and by reason ot the plunger collars bearing against the lower ends ot the push rods 79, the actuating levers 42 are pressed upwardly in contact with the cams 82, the positions ot the cams determining the positions ot said levers and consequently controlling the position ot the plungers against the action ot the spiral springs 68.

Each pump element also has a second nipple 82 provided with an axial bore 88, which is reduced at its inner end and opens into the axial bore or cylinder 51, said bore 83 serving as the oil outlet ot trie plunger cylinder. rlhe enlarged portion of said bore 83, or outlet passage as it may be termed, is internally threaded and the end thereof bears against the inner side ot the front wall of the casing. An equalizing passage 84 eX- tends from the outlet passage 88 into the counterbored portion at the lower end of the pump element, and slidably fitted in the lower portion ot the plunger cylinder and ei;- tending into said counterbored portion is an equalizing valv-e 85. Said equalizing valve is provided withV a collar 86 against which one end of a spirial spring 87 bears, the other end of said spring bearing against the inner wall ot' the bore formed in said sleeve nut, thus tending to keepV said va ve elevated Within the plunger cylinder so to normally shut oil? the outlet passage 88 oit said cylinder.

Associated with each pump element is oil feed sighting device 88, which is applied to the outer side ot the casing at any desir able point, but as arranged in the drawings, to the front of said casina. This sighting device includes a casting which comprises a transversely curved body portion 89, an inlet head 90 at the lower end of said body portion, and an outlet head 91 at'the upper end thereof. The inlet head has a. bore 92 formed therein which is co-axial with vche outlet passage 88 in the pump element and into which is fitted a control sleeve 98, which serves also as a means to secure the pump element to the tront wall ot the casing. For this purpose the sleeve is threaded at its inner end andthe outlet passage 88 correspondingly threaded to receive at least a part ot the threaded portion of said control sleeve, said sleeve having a head 94 at its outer end formed hexagonal or otherwise for convenience in applying a wrench or other suitable tool thereto tor the purpose ot threading said sleeve into said outlet passage, the head of said sleeve bearing against the outer side ot said inlet head. The bore ot this sleeve is enlarged at its inner end to form a shoulder 95 and the inner end ot the enlarged portion oit said bore is threaded to receive an externally threaded collar 96 which serves as a valve seat for an outwardly opening valve 97, prel erably a ball valve, against which one end olf a spiral s )ring 98 bears, the opposite end of said spring bearing against the shoulder 95 to keep said valve seated against said valve seat.

Gpening upwardly from the bore 92 to the top of the inlet head 90 is an oil passage 99. which is counter-bored from the upper end downwardly to form a shoulder 100 which serves as a valve seat, the upper portion ot said counterbore being threaded to receive a nozzle 101 which extends upwardly trom the upper tace ot said inlet head, said nozzle having its bore enlarged at its lower end to torni a. shoulder 102.

Seated against the shoulder or valve seat 100 is an upwardly or outwardly opening,` valve 103 against which one end ot a spiral spring 1011 bears, said spring bearing with its Vother end against the shoulder 10:2 formed in said nozzle and serving to hold said valve seated against the valve seat 100.

The control sleeve has an external annular groove 105 in line with the oil passage 99 'formed in the inlet head 90, said groove torming an annular chamber between said control sleeve and the wall ot the bore 92 in said inlet head, into which chamber opens one or more ports 106 extending radially from the bore of said control sleeve. Therefore, regardless ot whether or not the port or ports 106 have their axes coincident with the oil passage 99, communication will at all times be maintained between the bore or passage in said control sleeve and the oil passage 99 in said inlet hear. In a broad sense the bore ot said Control sleeve 98, the passage 99, and the bore ot the nozzle 101 may be considered as a continuation ot the outlet passage 88 formed in the pump element, or more particularly in the nipple 82 of said pump element.

In the upper tace ot the inlet head a circular recess 107 is termed, and around the marginal portion ot said recess an annular groove 108 is provided in which a corlr or other suitable gasket 109 is fitted. 110 designates a sight tube which has its lower end entered in said circular recess and its lower edge bearing against said gasket. The upper end of said sight tube, which is preferably constructed ot' glass, is entered in a vertical bore 111 formed in the outlet head 91 of the sighting device, said bore having its upper portion enlarged and internally threaded, as at 112. Resting upon the upper edge of said sight tube is a cork or other gasket 113 onto which is placed a metal washer114.

Threaded into the enlarged and internally threaded portion 112 of said vertical bore is a sleeve nut 115, reduced in diameter externally along' lower portion, as at 116, to form va shoulder 117, said reduced portion extending through the metal washer 114, the cork or other gasket 113, and into the upper end of the sight tube 110. The shoulder of said sleeve nut bears against the upper face of said metal washer and the upper edge thereof is provided with notches at diametrically opposite points, one of which is shown at 118 so that a suitable tool may be inserted into said notches for rotating said sleeve nut to tighten the gasket 113 against the upper end of the sight tube and Vat the same time press the lower end of said sight tube against the gasket 109 fitted into the inlet head of said sighting device. By using a metal washer in conjunction with the cork or other gasket 113, downward pressure is exerted by the sleeve nut 115 against said gasket Without imparting thereto rotary motion, as would occur if the sleeve nut werel in direct contact with the gasket, and in this manner the life of the gasket is prolonged since there is no tendency to move the same around the upper edge ofthe sight tube and cause the gas ket to be cut or otherwise injured. By interposing a metal washer between the gasket and the shoulder of said sleeve nut, the sleeve nut will ride over the metal washer While being'rotated in contact therewith. The up per end of the enlarged portion of the vertial here 111 is closed by a screw plug 119.

The outlet head 91 has'a bore 120 extending laterally therefrom and opening at its inner end to the bore 111. The bore 120 is threaded to] receive arsl'eevc nut 121 which extends through a fitting 122 formed against the inner side of the front wall of the casing. F or "this purpose the fitting 122 has a bore 123 throughwhich said sleeve nut is passed, said sleeve nut extending also Ythrough an opening in the front wall of the casing and being threaded into the bore120 of the outiet head 91. Said sleeve nut 121 is provided with a head which bea-rs against said Yfitting and forces the same firmly against the inner side of said front wall and at the same time draws the outlet head 91 of Jthe sighting element against a washer '125 inserted between said inlet "head and said front wall, thus asff suring an oil-tight connection at this point.

it is also to be noted that'a washer 126 is interposed between the inlet head 90 of the sighting element and the Yfront `wall of the casing, and that said inlet head' is forced firmly against said washer when tightening the control sleeve 93 into thel pump; element within the easing7 this vbeing due tothe head or said control sleeve bearing against the extends through the greater portion of the length of'said sleeve nut 121and has ports 127 opening thereinto. Said sleeve nut is providedwith an annular external groove 128 into which said ports open, said groove 'noviding an annular space between said sleeve nut and the wall of the bore 123 in said fitting so that upon tightening the sleeve nut the bore 123 will at all times be in communi;- cation with a bore 129 extending through a lateral nipple 130 forming part of said fit@ ting, this communication being effected regardless of whether or not thevaxes ofv said ports are coincident with the axis of the bore 129 in said nipple.

It is of course understood that a fitting 122 is used in connection with each pump element and the partsassociated therewith or, as it' may be termed, with each pumping unit, and that each of said fittings has an outlet pipe 131 connected therewith, said pipe being threaded into the nipple 130 and passed through the casing or chamber 13, and final- 'ly Vout through the rear wall 17 of said casing; or, if desired, through any of the other 'walls thereof. To guard against leakage of oil from the oil chamber outwardly along the Y outlet pipes, they are passed through stuifing boxes 132 carried by said pipes and having parts thereof at opposite sides of the wall'through which each pipe is led; or any other suitable means may be employed for this purpose. Each of the outlet pipes has a feed pipe 133 connected therewith outside ofthe casing, and these feed pipes are adapted to be ledto various pointsto which oil is to be fed in predetermined quantities. A The operating vshaft 28 extends voutwardly through opposite end walls of the casing,

and'to one endthereof is secured a crank arm- 134 having an actuating pitinan 135 pivotally connected to itsv outer end, said pitman being reciprocated byy any suitable mechanism so as to causelsaid crank arm to move through a circular'pat-h and thus rotate the operating'sh'a'ftin a positive manner.

- While l have shown a crank arm and pitl man-connected thereto to serve asmea-ns for mechanically rotating the operatingshaft, any other suitable vmechanism may be Vsubstl tuted therefor. At times it may `be found desirable to disconnect the shaft from `the machine-actuated mechanism, for example such as `include the crank arm 1 34 and the -pitman 130, and substitute therefor hand operated mechanism, and forthis purpose I have passed apin 136 through the opposite end of the operating shaft-to be used in connection with a hand lever V13'?, such as'show'n for example in Fig. *1, `in which'the hub of said lhand lever is provided with notches 138,

of said devices.

Then-the hand lever is placed over the shaft, the pin 186 will enter said notches 138, and by pressing inwardly upon the hand lever while causing the same to rock, or travel in a circular path, said lever will be maintained in locked connection with said pin and assure the rocking or the rotation of said operating shaft.

The body portion 89 of the sighting device is, as stated, transversely concaved and as it is preferably formed integral with the inlet and outlet heads 90, 91, respectively, these parts are in the form of a casting, and invariably in sighting devices of this type, re-V gardless of construction, it is difficult, at times, to see oil passing through the sight tubes, particularly owing to the fact parts behind the sight tubes become dusty and oftentimes soiled with oil, and when the dust becomes oil soaked it is found a diiiicult matter to keep such parts clean. To vovercome this I have provided removable transversely concaved linings or segments 189 which are slipped between the inlet and outlet heads of the sighting device and lie in contact with the transversely concaved body portions 89 The concaved surfaces of said linings or segments are covered with white or other light coveringmatter, baked or otherwise permanently applied thereto, or said surfaces may be enameled, or the linings or segments may be constructed of vitreous material properly glazed with light covering or facing material so that in looking through the sight tubes, a light background is provided for each. By having the concaved surfaces of said linings or segments glazed or highly polished and whitened or otherwise light colored,the passage of the oil vthrough the sight tube can be easily seen; and furthermore, by passing a cloth between the sight tubes and said linings or segments, which are preferably slightly spaced from the sight tubes, said linings or segments can be easily cleaned. If, over a length of time, it is found that the linings or segments have been badly soiled, they can be easily removed from the sighting elements and scrubbed, scoured, or otherwise cleansed, after which they can be easily replaced. These linings or segmentsV provide a light backing, through the medium of which the action of the globules of oil passing through the sight tubes, as andin the manner to be hereinafterl explained, can be easily seen and the quantity being fed ascertained.

VThe series of actuating levers 42 fulcrumed on the fulcrum Ybar or spindle 38 and'operated by the cams 32 cause actuation of all of the pump elements48 within the casing, and the amount of oil fed by each pump element depends upon the stroke of the piston plunger 56 and particularly the range of the stroke from the oil inlet 60 downwardly, such range being the effective stroke of the piston plunger. The limit of movement upwardly of the piston plungers is controlled by the stop elements 62, and the adjustmentof the push rods 7 9 within their supports, or more particularly, within the cylindrical bars or blocks carried at the outer ends of the actuating levers, effects the limit of movement of said plungers downwardly and regulates the range of movement of said plungers from the oil inlets G0 downwardly. rIhe operating shaft 28 is, as stated, mechanically actuated, but if desired, it may be manually actuated; provision being made at one end of said'shaft for the mechanical actuation of the same, and at the other end for manual actuation of the same.

1 have devisedineans for individually actuating each pump element by 'hand so that when it is found that the oil fed by any pump element'does not sufficiently lubricate a part connected therewith, such pump element mav be manually actuated independent of the actuation of the remaining pump elements, which latter may be actuated mechanically without affecting the manual actuation out the pump element deficient in its supply. For this purpose there is axially alined with each push rod 7 9 an individual actuating` dcvice 140 which is mounted in an opening formed in the removable cover or top wall of the casing directly above each push rod. Arranged in each opening is a rod guide or tubular member V141 having an enlargement or head 142 at its upper end, furnishing a downwardly facing shoulder which is adapted to bear againstrthe upperrsurface of said cover or top wall. rThis rod guide or tubular member is retained within said cover or top wall and suitable means provided to prevent upward movement thereof. In the embodiment shown, said rod guide or tubular member is provided with an annular groove in which a .split spring ring 143 is snapped, a collar 144 being` placed over said rod guide or tubular member above said ring and being held against said ring by a spiral spring 145 bearing with one end aga-instsaid collar and with its other end against the under side of the cover or top. The rod guidel or tubular member 141 is therefore held against lengthwise movement in one direction by the shoulder forming the under side of the enlargement or head 142, and the split spring ring 143. The internal diameter of said rod guide or tubular member is enlarged along its lower portion, and at diametrically opposite points is provided with longitudinal slots 146 which extend from the lower end of said guide or member upwardly anl terminate close to the upper end of the enlarged' internal diameter of said tubular member. The push rods 79 extend upwardly into the'rod guides or tubular members 141, and each push rod has a pin 147 paws-3d therethrough near its upper.' end, op-

' berf and the ieed of oil thereby convenientlv posite ends of said pin extending from the push rod and passing through the longitudinal slots 146 in said guide Or member.

Arially retained in the upper end ot' each rod guide or tulmlar member 141 and extending from the upper end thereof is an actuator rod 14S. Each actuator rod is provided with an enlargement or head 149 at upper ond and with an annular groove 150 between its ends, said groove being formed by tapering a portion of the rod downwardly to form an upwardlv-facing shoulderl 151. ri`he groove so formed is adaptedto receive the in. er ends of retainer pins 152 arranged within radial bores formed in the enlargement or head ot the rod guide or tubular member 141, each radial bore being threaded along its outer portion to receive the inner threaded ends of elongated knobs 158, cored or machined with axial bores extending inwardly from their inner ends. in the bores of each knob and the radial bores in the enlargement or head 142, spiral' springs 154 are arranged which exert pressure against the retainer pins 152 and cause them to engage the actuator rod axially arranged within said rod guide or tubular member. The elongated knobs 153 provide suitable handles for conveniently rotating the rod guide or tubular member 141.

By reason ot the pin and slot connection between said rod guides or tubular members land the push rods, said push rods may be rotated and adjusted within the actuating levers or, more particularly, within the cylindrical bars or blocks 76 ot said actuating levers, thus raising or lowering said push rods and thereby changing the effective strokes of their Cri-operating piston plungers.

It will be apparent, therefore, that although the push rods and the piston plungers are contined within the casing or oil chamber of the pump, said push rods can be easily adjusted 'from without the casing or oil chamregulated.

lVhen it is desired to operate a pump element individually, regardless of the actua.- tion ot its push rod by means of the mechanical drive connected therewith, it is simplyA necessary to depress the associated actuator rod, and upon pressure being exerted downwardly on said rod,t-he tapered portion of the retainer groove in said rod rides in contact with the inner ends eitheretainer pins 152, allowing said actuator rod to be moved downwardly so as to be brought into contact with the inner end ot the co-aXially-disposed push rod beneath the same and causedownward movement oi said push rod, which in turn causes downward swinging movement ot the actuating lever through which said push rod is threaded, and corresponding downward movement of t-he'piston plunger alined with said push rod. 1

Positioned within each of the signt tubes 1.10 is an oil guide wire 155. Each oil'iguide wire has a loop or eye 156 at its upper end and a crimped lower end 1527 entered into the nozzle 101. The crimped lower end of this wire occupies the'lull diameter of the bore or passage in said nozzle and when positioned in place prevents movement laterally of said guide wire within the sight tube. The eye of the oil guide wire is of suiiicient size to rest at opposite points against the sleeve nut- 115 by means of which the upper end of the sight tube is firmly clamped, and it can theretore be said to be suspended fromthe sleeve nut 115, and in this manner itis maintained in a fixed tube.

Each inlethead isy provided with an angulardrain passage 158, one end of which opens into the sight tube supported on said head and the other end opensthrough the side ot said head. A screw 159 is threaded into said drain passage to close the same and the head of the screw bears against a washed 160 seated in a recess formed in the outer side of said inlet head.

In oil pumps of this type, wherein the oil rises through liquid confined Within a sightV tubev and which is of heavier specific gravity than oil, the globules of oil rising through the liquid within the sight tube may appear magniied, and to one inexperiencedV it will be difficult to determinethe exact quantity of oil fed through the sight tube, With ,a view of readily determining the exact quantity of oil fed by the pump element, or each of the pump elements, as the case may be, I have embodied in the construction ot the pump, means to position axially within the sight cause the oil fed by the pump element, or

elements, to be delivered to the exterior, drop by drop, and for this purpose eachcontrol i,

sleeve 93 has its bore enlarged at its outer end to form an outwardly-facing shoulder 161. which serves as a valve seat, and this enlarged portion of lsaid bore is internally threaded from its outer end inwardly to within a short distance from said valve seat. In

this internally-'threaded portion of the bore of said control sleeve, a sleeve valve 1.62 is threaded, said sleeve valve'havmg a reduced inner end 163. The longitudinal bore-of said sleeve valve terminates short o1 the inner end so that the inner end of said sleeve valve vis p closed. The inner end portion of t'hebore ot the.V sleeve valve hasv a lateral'port 164 opening outwardly into the enlargedportion of the bore of said control sleeve, and by reason of the inner end of said sleeve valve being ahexagonal or'other non-circular flange 166 n is provided for conveniently rotating said valve with a wrench or other suitable t'oo'l, and when said sleeve val-ve 1s threaded wardly to its full extent, the inner closed end thereot is seated against the valve seat 151 formed in said conti'ol sleeve.

lVhen the sleeve valve, which may also be termed a test valve, is closed, the oil :ted into the control sleeve from the pump element is allowed to pass upwardly into the passage 99, and from the latter into the sight tube. Vhen, however, it is desired to ascertain or test the exact quantity oi oil fed by the pump without depending upon the appearance of oil Iglobules rising through the sight tube, the test valve 162 is unseated, and as the spring-pressed valve 103 in the passage 9) formed in the inlet head of the sighting device offers resistance to the oil fed by the ump element, the oil will be forced outwardly through the test valve, due to the tact that a tree passage is provided for the oil through the control sleeve and said test valve. The oil will drip from the outer end oitthe test valve, where the quantity ot the saine and the intervals between drops escaping therefrom can be easily detei'inined. While the oil is being so fed through the test valve, adjustment of the push rod 7 9 can be made to increase or diminish the supply of oil fed by the pump element, and when the pump is adjusted to feed the desired quantity the test valve may be closed and the oil will then be fed upwardly through the sight tube, and from the latter out of the pump to the point to be lubricated. Y

YV ith a view of preventing` rotation of the push rods within their rod supports 76, each of said rod supports, or more particularly de fined, each of said cylindrical bars or blocls has an axial bore 16T extending :trom the push rod threaded therethrough to one end of said bar or block, the outer end of said bore being threaded. In said bore 167 is a pressure member or block 168, which bears against the push rodv and is maintained'thereagainst by a spring 169 compressed within said bore by an abutment nut 170 threaded into the outer end of said bore, said spring serving to hold said pressure member against said push rod Vwith sufficient force to prevent accidental rotation of the ro'd Within the cylindrical bar or block.

The rotation or rocking ofthe operating shaft 28 causes oscillation of the actuating levers 42, due to the aetionoi` the cams 32, or

actuators, as they may be termed, against said levers, and by reason of the push rods 79 being carried by the outer ends of said levers, the piston plungers 58 are caused to reciprocate within the piston cylinders 51; movement in one direction oi said piston plu-ne'- ers being elected'by said push rods, while movement vin the opposite direction is caused by the springs 68. In Fig. 3, the piston plunger is shown in its lowermost position, dueto the fact'that the outermost point or throw Of the associated cani is in vcontact ywith the oo-acting actuating lever 42. As

the cani rotates and the roller 34 thereof, which is located at the throw of the cam, moves away from the lever, the spring 68 causes the push rod 79 to move upwardly, and due to the connection of said push rod with the actuating lever, said lever moves upwardly, retaining Contact with the cam 32. The piston plunger also rises during such action, ue to the action ot the spring 68, as stated, and when its lower end passes the oil inlet 160, :i quantity of oil enters from the oil chainoer 1e this oil entering under vacuum or being drawn inl by suction through the lilter 40 @nd tue inlet pipe 69.

l."Vhen the piston plunger is forced down- `wai-diy, as shown in Fig. the equalizing valve is 'forced downwardly by said plunger against the action of the spring 8T, due to -juger is in contact with the upper end ot said valve, but as the piston plunger rises the spring 8"? causes said valve to rise until the collar 86 thereon engages the shoulder 52 -formed by enlarging the lower end of thc p.. r cylinder. Vhen the equalizing valve is elevated it closes the outlet passage 83 olf' the pump element. Buring the downward novenient ot the actuating lever 42 the piston plunger lowers and the oil between the lower end or" said plunger and the equalizinff valve is subjected to pressure with he result that any part et the oil above the level of the lowerinost point of the oil inlet will be forced baclr into the oil chamber through said oil inlet; but-.at th nstant that the lower end ot the piston plunger is brought into alineinent with the lowermost point of said. oil inlet, the plunger acts upon the body of oil underneath the saine and forces the equalizingi' valve 85 downwardly, thus opening the outlet port and causingthe oil within the plunger cylinder to pass through said outlet port.

It is of course'to be understood that the enlarged portion oit the bore at the lower end oit each plunger cylinder is filled with il and that the relier" passage 84 is also filled with oil so that the oil is `forced outwardly into the control sleeve 93, the oil under pressure forcingthe ball valve 97 open against Vthe action of the spring with the result outlet head at least to the level of the bore 13?; in tire sleeve nut 121 are filled With wa- 'L ,Il t -e :act that the lower end of the piston ter', glycerine, or other liquid of greater specie gravity than oil. rlhe oil forced beyond the valve 103 rises within the liquid so confined and accumulates on the crimped portion of the guide wire 155 and forms itself into globules. The globules of oil pass upwardly through the water, glycerine, or other liquid within the sight tube while adhering to the guide wire and this oil frees itself and passes through the sleeve nut 121, enters the fitting 122 through which said sleeve nut is passed, and finally passes out through the outlet pipe 131, from which it is delivered into the feed tube V133, which is connected to a part to be lubricated, said tube and pipe being filled with oil.

By reason of the equalizing passage 84 connecting the space underneath the equalizing valve 85 with the space above the same, positive feed of the oil is assured and return of the oil from the outlet passage 88 to the plunger cylinder is prevented. By reason of the control sleeve 93 having an annular groove surrounding the same, into which the ports 106 open, the interior of said sleeve is at all times maintained in communication with the passage 99 in the inlet head of the sighting device, and this communication is herefore maintained, even though the ports are out of alinement with said passage 99.

`When it is desired to remove the sight tube 110 for the purpose of cleaningvthe interior of the same, it is simply necessary to remove the screw plug 119 from the outlet head 91, unthread the sleeve nut 115 and withdraw the saine from said inlet head, after which, the washer 114, the gasket 113, and said sight tube can be thrust upwardly through said outlet head. This, however, causes the lower end of said sight tube' to be unseated from the gasket 109 fitted into the inlet head 90; and for this reason it is desirable to provide means for draining the liquid contents of the sight tube before loosening said tube from between the gaskets 109 and 113. To accomplish this, the screw 159 is removed from the drain passage 158 within the inlet head, allowing the liquid contents to flow out through said passage. lf desired, a small vessel may be positioned underneath the inlet head to receive the liquid contents of the sight tube when drained. After removing and again replacing the sight tube,tlie liquid may be poured back into the sighting device.

By enameling or otherwise finishing the concaved surfaces of the lining or segments 139, preferably white, clear vision can be had through the sight tubes 110, and by reason of having said segments polished they can be easily kept in clean condition by passing a cloth between Athe same and the sight tube. Furthermore, these white or light surfaces, readily seen through the glass tubes,

give the pump a neat appearance, in addition it to providing the advantage set forth.l

The rod guide or tubular member 141 may also be termed an adjusting sleeve, eXteriorly `operable, since by rotating the same, the push rods are adjusted within the outer ends vof the actuating levers 42, and these adjusting sleeves serve also as guides for the manual actuator rods 148. The upward movement of each actuator rod 148 is limited bythe shoulderV 151 thereof coming in Contact with therretainer pins 152, and by reason of the annular groove 150 in said actuator rod being tapered downwardly, said rod can be forced downwardly through the adjusting sleeve 141 without offering resistance to such action, said action being permitted due to the retainer pins 152 receding within their pockets when the tapered portion of said groove passes in contact therewith.` By forcing any one of the actuator rods downwardly against its associated push rod? 9, the latter will be forced downwardly' and compel the piston plunger directly lunderneath to be lowered and feed a' quantity of oil to the sight tube 110 connected with the particular pumping unit of which said plunger forms part. The action of' the spring 68 against the collar 58 of said piston-plunger is imparted to said lpush rod and by the latter to the actuator rod 148, at least through a part of the upward movement of said Vactuator rod; the final upward movement, however, being accomplished manually and being limited by the retainer pins coming in contact with the shoulder 151 on said actuator rod.

Having thus described my invention, whaL l claim is 1. An'oil pump, comprising a casing, an operating shaft journaledV in opposite walls of said casing, cams on said shaft, each comprising two spaced disk-like members eX- tended outwardly at one point to form the throw of the cani and a roller rotatable between the outwardly-extended portions of said spaced members, pump elements within said casing, and actuating mechanism between said cams and said pump elements.-v

2. An oil pump, comprising a casing, an operating sha-ft extending through said cas'- ing, cams on said lshaft in spaced relation, each cam comprising two disk-like members extended outwardly at corresponding points to form the throw of the cam, and a roller rotatably mountedbetween the outwardlyextended portions of said disk-like members, a fulcrum spindle arranged parallel with said operating shaft, actuating levers mounted on said spindle kfor co-actioii with saidv cams and over and in contact withwhich the rollers of said cams ride, push rods carried by said actuating levers, and a plurality of pump elementsoperated by said push rods.

3. An oil pump, comprising a casing', a fulcrum spindle extending through said casing and supported at opposite ends by opposite walls of said casing, actuating levers'fulcrumed on said spindle, each actuating lever having two side members and a cross member connecting the upper enges ot said side members, supported cams acting against the cross members of said actuating levers, a rotatable element supported by the side memn bers of each actuating lever, apush rod threaded through each rotatable element, and a plurality oit pump elements, each having a piston plunger engaged by one of said push rods.

ll. An oil pump, comprising a pump element, an actuating lever having spaced side members and a cross member connecting the lupper edges ot said side members, said lever being fulcruined at one end and having alined openings in its side members at the other end thereof, Aa cylindrical member extend ing through said alined openings and having an annular groove near each end, a spring ring fitted into each ot' said grooves and bearing against the outer side ot each side member of said actuating lever, and a push rod adjustably threaded through said cylindrical member and adapted to actuatc said pump element.

5.y An oil pump, comprising a pump element including a piston plunger and a spring to keep said piston plunger at the end of its movement in one direction, an actuating lever ulcrumed at one end and `having a supporting element rotatably retained at itsother end, a push rod extending adjustably throughfsaid supporting element and adapted to actuate the piston plunger against the action of said spring, and means to maintain said push rod in adjusted position.

6. An oil pump, comprising a pump element including a piston plunger and a spring Vfor moving said piston plunger in one direction and maintaining the same at the end of its movement in such direction, an actuating lever fulcruined at one end,V a rod support carried by the other end ot said lever and mounted for slight rotary movement, a push rod threaded through said rod support and adjustable therein, and a spring-pressed element within said rod support bearing against said push rod :tor maintaining the same in adjusted position, said push rod serving to actuate said piston plunger against the action of said sprinO.

7. An oil pump, comprising a casing, a pump element within said casing adapted to feed oil outside of said casing and including a piston plunger and a spring `for moving said piston plunger in one direction and maintaining the said plunger at the end of its movement in such direction, an actuating element, means for operating said actuating element, a rod support carried by said actuating element and mounted for slight rotary movement, a push rod adjustably firasie threaded through said rod support and adapted to actuate said piston plunger against the action of said spring, and a manually-operated device adapted to actuate said push rod independent of said actuating element.

8. An oil pump, comprising a pump element, an actuating lever iculci'umed at one end and having two parallel side members and a cross member connecting the upper ends of said side members, said side inembers having alined openings at their outer snes, a cylindrical member rotatablv .mounted within said alined openings, a push rod adjustably threaded through said cylindrical member between saitL side members. said cvlindrical member having an axial bore therein extending from said insb rod outwardly to lone end thereof, a pressure hlocl: in said axial opening, an abutment nut within axial bore spaced 'trom said pressure block, and a spring irfierpose.,1 between said bressure block and said abutment nut to torce said bloeit said push rod so as to hold said rou against rotary movement within said cylind 1ical i iember.

9. An oil pump,comprisingacasing, apump element within casing including piston plunger, actuating mechanism also wi* said l thin said casing including a push rod ror actuating said piston plunger in one direction, means to cause movement ot said plunger in 1 n l n v tue opposite direction, a rotatable member carried byV sain casing into w ich the upper end of said push rod entends, connection betwecp sind rotatable member and said push rod rer allowing said push rod limited movement lengthwise with respect to said rotatahie member but compelling said push rod to rotate withwsaid .rotatable n'iember, and means carried oy said rotatable member to actuate said push rod independently of said actuating mechanism.

10. An oil pump, comprising a casing, a pump element wit i said cucire' an actuating element also wit iin said cfuing, means for operating said actuating clement, push rod adj ustably threaded through said actuating element av d adapted tor opcrati said pump element, and a unitary structure accessible trom the exterior of saidA c sing for adjusting said push' rod within .said actuating element or for actuating said pu h rod man# independent of the actuation or" said Vlng element.

ll. An oil puinp, comprisine` a casing. a pump element within said casiiie, an actiiating lever i'ulcrumcd at one and and havin@` a support at its other end, slightly rotatable during the movement of said actuating lever. means for operating said actuating lever, push rod adjustably threaded tirorgh sai-'l rotatable support, rotatable elcmc iounted in the top of said casing and receiving the LII end of said push rod, said push rod a pin extending therefrom and said e eiement having a slot receiving the ng portion of said pin.

12. An oil pump, comprising a casing, a pump element withinV saidlcasing, actuating mechanism including a push rod for operating said 1pump element, and a longitudinally movable actuator rod aliined with said push rod and normally spaced therefrom, actuator'rod being non-operable by said push rod.

13. An oil pump, comprising a casing, a pump element within said casing, actuating mechanism including a push rod for actuating said oil pump, a rod guide in one wall of said casing, an actuator rodiwithin said rod guide co-ax'al with said push rod and adapted for reciprocating movement, said actuator rod being non-operable by said push rod, and means for normally holding said actuator rod in spaced relation to'said push rod.

14. ein oil pump, comprising a casing, a Ypump elemen within said casing, a rod alined with said pump element for actuating the same, an actuating r rying said push rod, means for actuating element, a rod guide of said. casing, an actuator i'o movement in said rod guide and having an annular groove provided with a dcwnwardlytapered portion and an upwardiyfacinfshoulder, and a spring-pressed retainer pin in said rod guide normally entered in said groov and held against said shoulder.

15. An oil pump, comprising casing, a pump element within said casing, an actuating lever also within said casi: W a rod support carried by said lever, a push rod adiustable within said rod su )port and adapted -for eo-action with said pump element, and

vmeans alined with said push rod for adjustthe same within said rotatable rod sup- A port from the exterior of said casing and for actuating said push rod manually during the actuation of said actuating lever or when actuation of said actuating lever is stopped.

16. An oil pump, comprising a casing, a plurality of pump elements within said casing, an actuating element for each pump element having a rod support rotatably mounted thereon, a push rod adjustably threaded through each rod support and adapted to actuate one of said pump elements, a single operating element for actuating said actuating` elements, a tubular element receiving one end of each push rod and rotatable in a. wall of said casing, a pin and slot connected between each push rod and its receiving tubular element to allow the push rod to move lengthwise therein but compel said push rod to rotate with said tubular element, a manually operable actuator rod reciprocable within each tubular element and co-axial with and ing element vinto which said push rod is threaded for adjustment, a rotatable element in the top Wall of said casing co-axial with said push rod, connection between said push rod and said rotatable element whereby said lrod may reciprocate independent of said rotatable element and whereby said push rod is caused to be rotated upon rotating said rotatable element, and means carried by said rotatable element non-operable by said push rod for manually actuating said push rod during the actuation of said actuating element or when actuation of said actuating element is stopped.

18. An oil pump, comprising a casing, a pump element within said casing, a push rod for actuating said pump element, a rotatable element carried byV a Wall of said casing coaxial withsaid push rod and into which one end of said push rod extends, a-pin andV slot connection between said push rod and said rotatable element, an actuator rod within said rotatable element (2o-axial with said push rod and normallyspaced therefrom, a radial bore in said rotatable element threaded along its outer portion, an elongated knob threaded into the threaded portion of said radial bore and having an axial bore therein, a retainer pin within the radialbore of said rotatable element, and a spring within said radial bore and the bore of said elongated knob exerting pressure against said retainer pin and forcing the latter against said actuator rod to hold the same in spaced relation to said push rod.

19. Anoil pump, comprising a casing, a pump element within said casing, an actuating lever fulcrumed at one end, a rotatable rod support mounted in the other end of said actuating lever, a push rod adjustably threaded through said rod support and adapted to actuate said pump element, pins passed through said push rod in spaced relation and having` opposite ends thereof extending from said rod to limit the range of adjustment of said push rod within said rotatable rod sup port` and means for rotating said push rod within said rod support.

20. An oil pump, comprising a casing, a

casing providing a shoulder bearing. against the outer surface of said wall, said tubular member having also an annular groove, a spring ring fitted into said groove, a collar surrounding said tubular member and bearing against said spring ring in spaced relation to said wall, and a spiral spring surrounding said tubular member and bearing with one end against the inner surface ot said wall and with its other end against said collar.

21. An oil pump, comprising a casing, a pump element within said casing having an inlet nipple and a piston plunger, a sleeve nut threaded into said inlet nipple, a stop device clamped between said nipple and sleeve nut and extending upwardly therefrom, said stop device having stop ears lying in the path of said piston plunger, a spring acting to move said piston plunger in one direction and normally retain the same against said stop ears, a push rod co-axial with said piston plunger and adapted to move the same in the opposite direction, and an actuating element in which said push rod is adjustably mounted.

22. An oil pump, comprising a casing, a pump element within said casing having a cylinder, an inlet nipple extending therefrom and a piston plunger reciprocable therein, a collar threaded onto the upper end of said piston plunger, a spring surrounding said cylinder and exerting pressure upwardly against said collar, a sleeve nut threaded into said inlet nipple, a stop device clamped between said inlet nipple and said sleeve nut and extending upwardly therefrom, said stop device having stop ears in the path oisaid collar adapted to be engaged by said collar to limit the upward movement ot said piston plunger, an actuating lever tulcrumed at one end, means Jfor mechanically actuating said lever, a push rrod'adjustably threaded through the other end of said lever and coaxial with said piston plunger, and means accessible from the exterior of said casing for adjusting said push rod within said actuating lever to regulate the downward stroke ot said piston plunger.

23. An -oil pump, comprising a casing having alined openings in opposite walls, a bearing in each ot said openings and extending outwardly therefrom, each bearing being in the form of a stuiiing box, an ope 1ating shaft having opposite cylindrical ends journaled in said bearings, and an enlarged noncylindrical portion between said bearings -forming shoulders in contact with the `inner ends of said bearings, spaced cams on the non-cylindrical portion of said operating shaft, spacing sleeve on said operating shaft between said cams and between the end cams and said bearings, actuating levers tulcrumed at one end and adapted to be operated by said cams, pump elements within said casing, and means between said actuating levers and said pump elements to cause actuation of said pump elements when said actuating levers are actuated.

24h. An oil pump, comprising a casing, a pump element within said casing having a cylinder provided with an inlet nipple and a piston plunger witnin said cylinder, a sleeve nut threaded into said nipple, a stop element mounted on said sleeve nut and clamped between the same and said nipple, said stopl element being formed of sheet metal fashioned to provide side members and a connecting cross member and said side members having stop ears extending therefrom adapted to be engaged by said piston plunger to limit the movement of the same in one direction, and means to move said piston plunger in the opposite direction.

25. An oil pump, comprising a casing having an opening in its bottom and an opening in one of its side walls, a pump element comprising a casing having an axial bore, a lateral inlet-passage and a lateral outlet passage, said axial bore being alined with the opening in said bottom and said outlet passage being alined with the opening in said side wall, a plunger piston within said axial bore, means for actuating said plunger piston, a cap sleeve threaded into the lower end ot said axial bore and having an externally threaded boss extending through the opening in said bottom, a nut applied to said externally-threaded boss and bearing against the under side oiq said bottom, a sighting device at the outside of said side wall connected at one end with said out-let passage, an outlet pipe within said casing connected to the other end of said sighting device, and a feed pipe connected with said outlet pipe.

26. An oil pump comprising a casing, a. pump element within said casing having a casting provided with an axial bore enlarged at its lower end and having the enlarged portion of said bore internally threaded, said casting having an oil inlet and an oil outlet communicating with the exterior of said casing, a cap sleeve threaded into the enlarged lower portion of said axial portion and resting against the bottom ot said casing, a piston plunger within the upper end of said axial bore, an equalizing valve within the lower end ot said axial bore and extending into said cap sleeve, an equalizing passage between said outlet passage and the enlarged lower portion of said axial bore, a spring serving to torce said equalizing valve upwardly, and means for actuating said piston plunger.

27. An oil pump, comprising a casing, a pump element within said casing, mechanically-operated actuating mechanism for said pump element including an adjustable push rod adapted to actuate said pump element, a freely ulcrumed lever carrying said push 

